✨ Add experiments directory.

experiments/scripts/trace.sh

@@ -0,0 +1,58 @@
+#!/usr/bin/env sh
+
+set -ex
+
+combine(){
+pnmpaste -or tmp/cmask-invert-${1}.pbm 0 0 tmp/cmask-invert-${2}.pbm >  tmp/combine-tmp.pbm
+mv tmp/combine-tmp.pbm tmp/cmask-invert-${2}.pbm
+}
+
+invert() {
+pnminvert tmp/cmask-${1}.pbm > tmp/cmask-invert-${1}.pbm
+}
+
+invert2() {
+pnminvert tmp/cmask-invert-${1}.pbm > tmp/cmask-${1}.pbm
+}
+
+mask() {
+ppmcolormask "#${1}" $INPUT_FILE > tmp/cmask-${1}.pbm
+}
+
+trace() {
+#potrace --svg --opttolerance 5 --alphamax 1.334 tmp/cmask000.pbm
+potrace --svg --color "#${1}" tmp/cmask-${1}.pbm
+}
+
+svg_prepend(){
+xsltproc --stringparam prepend tmp/cmask-${1}.svg combine.xslt trace-output.svg > tmp/combine-tmp.svg
+mv tmp/combine-tmp.svg trace-output.svg
+}
+
+#COLORS=ffffff c5eeff ddd9d4 fdb696 c9463b 736026 af1a1a 3c3b39 6e0c00
+COLORS="6a0909 302621 22323f af1a1a 43551e 60492d 3f515f 8f3131 7a543b 677a88 e17070 e99282 b3adad f6b18f ffd86f d5dfe1 f2f2f2 ffffff"
+INPUT_FILE=$1
+
+mask 000000
+invert 000000
+
+previous=
+
+for color in $COLORS
+do
+  mask ${color}
+  trace ${color}
+  invert ${color}  
+  combine ${color} 000000
+  if [ -n "$previous" ] 
+  then
+    svg_prepend ${color} 
+  else 
+    cp tmp/cmask-${color}.svg trace-output.svg
+  fi
+  previous=${color}
+done
+
+invert2 000000
+trace 000000
+svg_prepend 000000